| 摘要 |
<p>An optical imaging system 1 for generating an image of an object plane comprises a lens system which comprises a main objective 20 and a reduction optical unit upstream of the main objective 20 and which is aligned along an optical axis 23. The reduction optical unit comprises a first lens 22 with a positive refractive power 22 and a second lens 21 with a negative refractive power. An object-side first main plane H and an image-side second main plane H' are defined by the lens system. The optical imaging system defines an observation beam path which is guided through the lens system in such a way that, in the first main plane H and in the second main plane H', the observation beam path in each case has a distance B from the optical axis of the lens system. According to the invention, the first lens 22 is manufactured from a first material which has a first Abbe number and the second lens 21 is manufactured from a second material which has a second Abbe number, wherein the first Abbe number is greater than the second Abbe number. The lens system is configured in such a way that the following relation is satisfied for a wavelength range ʎ of 480 nm≤ʎ≤660 nm and for a main wavelength e=546 nm: where: fe = object-side focal length for the main wavelength e in respect of the first main plane H; f2 = object-side focal length for the wavelength ʎ in respect of the first main plane H; fe' = image-side focal length for the main wavelength e in respect of the second main plane H'. Refer to Figure 1</p> |
